<form action="<?php echo url_for('inicio/index') ?>" method="POST">
  <table>
    <?php echo $formulario ?>
    <tr>
      <td colspan="2" align="center">
      <br>
        <button><?php echo image_tag("tick.png") ?> Enviar</button>
      </td>
    </tr>
  </table>
</form>